linux-kernel - [PATCH 09/11] spmi: pmic-arb: check apid enabled before calling the handler

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Date:   Wed, 10 May 2017 19:55:39 +0530
From:   Kiran Gunda <kgunda@...eaurora.org>
To:     Kiran Gunda <kgunda@...eaurora.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
        linux-kernel@...r.kernel.org
Cc:     Timur Tabi <timur@...eaurora.org>, linux-arm-msm@...r.kernel.org,
        adharmap@...cinc.com, aghayal@....qualcomm.com
Subject: [PATCH 09/11] spmi: pmic-arb: check apid enabled before calling the handler

From: Abhijeet Dharmapurikar <adharmap@...eaurora.org>

The driver currently invokes the apid handler (periph_handler())
once it sees that the summary status bit for that apid is set.

However the hardware is designed to set that bit even if the apid
interrupts are disabled. The driver should check whether the apid
is indeed enabled before calling the apid handler.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@...eaurora.org>
Signed-off-by: Kiran Gunda <kgunda@...eaurora.org>
---
 drivers/spmi/spmi-pmic-arb.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index ad34491..f8638fa 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -536,8 +536,8 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 	void __iomem *intr = pa->intr;
 	int first = pa->min_apid >> 5;
 	int last = pa->max_apid >> 5;
-	u32 status;
-	int i, id;
+	u32 status, enable;
+	int i, id, apid;
 
 	chained_irq_enter(chip, desc);
 
@@ -547,7 +547,11 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 		while (status) {
 			id = ffs(status) - 1;
 			status &= ~BIT(id);
-			periph_interrupt(pa, id + i * 32);
+			apid = id + i * 32;
+			enable = readl_relaxed(intr +
+					pa->ver_ops->acc_enable(apid));
+			if (enable & SPMI_PIC_ACC_ENABLE_BIT)
+				periph_interrupt(pa, apid);
 		}
 	}
 
-- 
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